Documentation doesn't open properly?

I'm sure this is such a noob question but, when I click on the little documentation icons on the components to go straight to the manual, it opens up in notepad with just garabage letters on it. I can't find preferences or anything to change this so it opens properly? I'm sure it's an easy fix, thanks.

Fyi, it opens up like so:

<title>Unity - Manual: Transform</title>
<meta name="description" content="Unity is the ultimate game development platform. Use Unity to build high-quality 3D and 2D games, deploy them across mobile, desktop, VR/AR, consoles or the Web, and connect with loyal and enthusiastic players and customers.">
<meta name="author" content="Unity Technologies">
<link rel="shortcut icon" href="../StaticFilesManual/images/favicons/favicon.ico">
<link rel="icon" type="image/png" href="../StaticFilesManual/images/favicons/favicon.png">
<link rel="apple-touch-icon-precomposed" sizes="152x152" href="../StaticFilesManual/images/favicons/apple-touch-icon-152x152.png">

 

It’s trying to open an HTML file. You need to tell Windows to use the web browser to open HTML files.

Other people have had the same issue:

http://forum.unity3d.com/threads/unity-opens-html-files-in-notepad-solved.344162/

http://answers.unity3d.com/questions/1090566/open-reference-button-opens-notepad-instead-of-tak.html

Maybe this will help:

http://windows.microsoft.com/en-us/windows/change-default-programs#1TC=windows-7

 

That was easy, thanks boolfone.

Just for anyone else's reference:

If you find those documentation files in your C drive, right click on any one of them, go to properties, and change the default to open html files with internet explorer instead of notepad/notepad++.